Dark red mark on arm post blood test. Medical attention required?
Day before Yesterday I had blood taken from me for a blood test , from my arm . (for just regular check up). Today i noticed that from where the blood was taken in that location almost 12 cm long & 5cm wide area got the dark red mark . What is this? Is there any thing to worry about ? is there any need to consult any doctor? Even i gave the blood many time for the test but this happens first time.